Worms create two types of fertilizer: solid and liquid. The solid fertiliser, also known as “worm castings”, will develop in the middle and top layers and will be ready for harvest every 4-6 months. Just scrape away the top level and harvest the castings – they look like rich, dark soil.
The liquid fertiliser is worm wee, and will accumulate at the bottom of the worm farm. Just turn the tap at the bottom and empty the liquid into a container. Dilute one part wee with seven parts water for a great fertiliser.